annotate signkey.c @ 44:45edf30ea0a6

Improved signkey code
author Matt Johnston <matt@ucc.asn.au>
date Tue, 03 Aug 2004 15:51:55 +0000
parents b4874d772210
children 095d689fed16
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1 /*
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2 * Dropbear - a SSH2 server
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3 *
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4 * Copyright (c) 2002,2003 Matt Johnston
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5 * All rights reserved.
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6 *
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7 * Permission is hereby granted, free of charge, to any person obtaining a copy
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8 * of this software and associated documentation files (the "Software"), to deal
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9 * in the Software without restriction, including without limitation the rights
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10 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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11 * copies of the Software, and to permit persons to whom the Software is
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12 * furnished to do so, subject to the following conditions:
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13 *
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14 * The above copyright notice and this permission notice shall be included in
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15 * all copies or substantial portions of the Software.
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16 *
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17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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18 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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20 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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21 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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22 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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23 * SOFTWARE. */
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24
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25 #include "includes.h"
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26 #include "dbutil.h"
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27 #include "signkey.h"
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28 #include "buffer.h"
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29 #include "ssh.h"
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30
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31 /* malloc a new sign_key and set the dss and rsa keys to NULL */
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32 sign_key * new_sign_key() {
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34 sign_key * ret;
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36 ret = (sign_key*)m_malloc(sizeof(sign_key));
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37 #ifdef DROPBEAR_DSS
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38 ret->dsskey = NULL;
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39 #endif
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40 #ifdef DROPBEAR_RSA
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41 ret->rsakey = NULL;
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42 #endif
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43 return ret;
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45 }
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46
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47 /* Returns "ssh-dss" or "ssh-rsa" corresponding to the type. Exits fatally
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48 * if the type is invalid */
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49 const char* signkey_name_from_type(int type, int *namelen) {
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50
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51 #ifdef DROPBEAR_RSA
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52 if (type == DROPBEAR_SIGNKEY_RSA) {
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53 *namelen = SSH_SIGNKEY_RSA_LEN;
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54 return SSH_SIGNKEY_RSA;
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55 }
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56 #endif
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57 #ifdef DROPBEAR_DSS
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58 if (type == DROPBEAR_SIGNKEY_DSS) {
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59 *namelen = SSH_SIGNKEY_DSS_LEN;
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60 return SSH_SIGNKEY_DSS;
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61 }
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62 #endif
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63 dropbear_exit("bad key type %d", type);
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64 return NULL; /* notreached */
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65 }
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66
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67 /* Returns DROPBEAR_SIGNKEY_RSA, DROPBEAR_SIGNKEY_DSS,
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68 * or DROPBEAR_SIGNKEY_NONE */
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69 int signkey_type_from_name(const char* name, int namelen) {
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70
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71 #ifdef DROPBEAR_RSA
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72 if (namelen == SSH_SIGNKEY_RSA_LEN
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73 && memcmp(name, SSH_SIGNKEY_RSA, SSH_SIGNKEY_RSA_LEN) == 0) {
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74 return DROPBEAR_SIGNKEY_RSA;
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75 }
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76 #endif
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77 #ifdef DROPBEAR_DSS
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78 if (namelen == SSH_SIGNKEY_DSS_LEN
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79 && memcmp(name, SSH_SIGNKEY_DSS, SSH_SIGNKEY_DSS_LEN) == 0) {
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80 return DROPBEAR_SIGNKEY_DSS;
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81 }
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82 #endif
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83
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84 return DROPBEAR_SIGNKEY_NONE;
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85 }
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86
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87 /* returns DROPBEAR_SUCCESS on success, DROPBEAR_FAILURE on fail.
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88 * type should be set by the caller to specify the type to read, and
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89 * on return is set to the type read (useful when type = _ANY) */
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90 int buf_get_pub_key(buffer *buf, sign_key *key, int *type) {
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91
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92 unsigned char* ident;
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93 unsigned int len;
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94 int keytype;
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95 int ret = DROPBEAR_FAILURE;
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96
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97 TRACE(("enter buf_get_pub_key"));
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98
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99 ident = buf_getstring(buf, &len);
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100 keytype = signkey_type_from_name(ident, len);
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101 m_free(ident);
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102
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103 if (*type != DROPBEAR_SIGNKEY_ANY && *type != keytype) {
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104 return DROPBEAR_FAILURE;
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105 }
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106
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107 *type = keytype;
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108
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109 /* Rewind the buffer back before "ssh-rsa" etc */
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110 buf_incrpos(buf, -len - 4);
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111
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112 #ifdef DROPBEAR_DSS
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113 if (keytype == DROPBEAR_SIGNKEY_DSS) {
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114 dss_key_free(key->dsskey);
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115 key->dsskey = (dss_key*)m_malloc(sizeof(dss_key));
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116 ret = buf_get_dss_pub_key(buf, key->dsskey);
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117 if (ret == DROPBEAR_FAILURE) {
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118 m_free(key->dsskey);
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119 }
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120 }
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121 #endif
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122 #ifdef DROPBEAR_RSA
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123 if (keytype == DROPBEAR_SIGNKEY_RSA) {
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124 rsa_key_free(key->rsakey);
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125 key->rsakey = (rsa_key*)m_malloc(sizeof(rsa_key));
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126 ret = buf_get_rsa_pub_key(buf, key->rsakey);
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127 if (ret == DROPBEAR_FAILURE) {
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128 m_free(key->rsakey);
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129 }
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130 }
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131 #endif
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132
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133 TRACE(("leave buf_get_pub_key"));
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134
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135 return ret;
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136
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137 }
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138
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139 /* returns DROPBEAR_SUCCESS on success, DROPBEAR_FAILURE on fail.
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140 * type should be set by the caller to specify the type to read, and
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141 * on return is set to the type read (useful when type = _ANY) */
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142 int buf_get_priv_key(buffer *buf, sign_key *key, int *type) {
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143
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144 unsigned char* ident;
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145 unsigned int len;
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146 int keytype;
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147 int ret = DROPBEAR_FAILURE;
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148
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149 TRACE(("enter buf_get_priv_key"));
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150
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151 ident = buf_getstring(buf, &len);
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152 keytype = signkey_type_from_name(ident, len);
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153 m_free(ident);
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154
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155 if (*type != DROPBEAR_SIGNKEY_ANY && *type != keytype) {
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156 return DROPBEAR_FAILURE;
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157 }
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158
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159 *type = keytype;
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160
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161 /* Rewind the buffer back before "ssh-rsa" etc */
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162 buf_incrpos(buf, -len - 4);
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163
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164 #ifdef DROPBEAR_DSS
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165 if (keytype == DROPBEAR_SIGNKEY_DSS) {
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166 dss_key_free(key->dsskey);
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167 key->dsskey = (dss_key*)m_malloc(sizeof(dss_key));
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168 ret = buf_get_dss_priv_key(buf, key->dsskey);
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169 if (ret == DROPBEAR_FAILURE) {
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170 m_free(key->dsskey);
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171 }
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172 }
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173 #endif
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174 #ifdef DROPBEAR_RSA
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175 if (keytype == DROPBEAR_SIGNKEY_RSA) {
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176 rsa_key_free(key->rsakey);
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177 key->rsakey = (rsa_key*)m_malloc(sizeof(rsa_key));
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178 ret = buf_get_rsa_priv_key(buf, key->rsakey);
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179 if (ret == DROPBEAR_FAILURE) {
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180 m_free(key->rsakey);
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181 }
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182 }
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183 #endif
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184
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185 TRACE(("leave buf_get_priv_key"));
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186
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187 return ret;
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188
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189 }
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190
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191 /* type is either DROPBEAR_SIGNKEY_DSS or DROPBEAR_SIGNKEY_RSA */
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192 void buf_put_pub_key(buffer* buf, sign_key *key, int type) {
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193
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194 buffer *pubkeys;
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195
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196 TRACE(("enter buf_put_pub_key"));
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197 pubkeys = buf_new(1000);
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198
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199 #ifdef DROPBEAR_DSS
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200 if (type == DROPBEAR_SIGNKEY_DSS) {
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201 buf_put_dss_pub_key(pubkeys, key->dsskey);
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202 }
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203 #endif
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204 #ifdef DROPBEAR_RSA
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205 if (type == DROPBEAR_SIGNKEY_RSA) {
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206 buf_put_rsa_pub_key(pubkeys, key->rsakey);
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207 }
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208 #endif
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209 if (pubkeys->len == 0) {
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210 dropbear_exit("bad key types in buf_put_pub_key");
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211 }
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212
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213 buf_setpos(pubkeys, 0);
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214 buf_putstring(buf, buf_getptr(pubkeys, pubkeys->len),
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215 pubkeys->len);
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216
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217 buf_free(pubkeys);
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218 TRACE(("leave buf_put_pub_key"));
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219 }
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220
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221 /* type is either DROPBEAR_SIGNKEY_DSS or DROPBEAR_SIGNKEY_RSA */
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222 void buf_put_priv_key(buffer* buf, sign_key *key, int type) {
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223
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224 TRACE(("enter buf_put_priv_key"));
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225 TRACE(("type is %d", type));
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226
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227 #ifdef DROPBEAR_DSS
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228 if (type == DROPBEAR_SIGNKEY_DSS) {
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229 buf_put_dss_priv_key(buf, key->dsskey);
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230 TRACE(("leave buf_put_priv_key: dss done"));
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231 return;
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232 }
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233 #endif
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234 #ifdef DROPBEAR_RSA
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235 if (type == DROPBEAR_SIGNKEY_RSA) {
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236 buf_put_rsa_priv_key(buf, key->rsakey);
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237 TRACE(("leave buf_put_priv_key: rsa done"));
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238 return;
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239 }
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240 #endif
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241 dropbear_exit("bad key types in put pub key");
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242 }
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243
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244 void sign_key_free(sign_key *key) {
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245
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246 TRACE(("enter sign_key_free"));
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247
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248 #ifdef DROPBEAR_DSS
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249 dss_key_free(key->dsskey);
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250 key->dsskey = NULL;
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251 #endif
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252 #ifdef DROPBEAR_RSA
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253 rsa_key_free(key->rsakey);
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254 key->rsakey = NULL;
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255 #endif
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256
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257 m_free(key);
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258 TRACE(("leave sign_key_free"));
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259 }
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260
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261 static char hexdig(unsigned char x) {
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262
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263 if (x > 0xf)
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264 return 'X';
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265
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266 if (x < 10)
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267 return '0' + x;
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268 else
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269 return 'a' + x - 10;
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270 }
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271
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272 /* Since we're not sure if we'll have md5 or sha1, we present both.
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273 * MD5 is used in preference, but sha1 could still be useful */
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274 #ifdef DROPBEAR_MD5_HMAC
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275 static char * sign_key_md5_fingerprint(sign_key *key, int type) {
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276
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277 char * ret;
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278 hash_state hs;
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279 buffer *pubkeys;
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280 unsigned char hash[MD5_HASH_SIZE];
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281 unsigned int h, i;
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282 unsigned int buflen;
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283
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284 md5_init(&hs);
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285
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286 pubkeys = buf_new(1000);
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287 buf_put_pub_key(pubkeys, key, type);
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288 /* skip the size int of the string - this is a bit messy */
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289 buf_setpos(pubkeys, 4);
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290 md5_process(&hs, buf_getptr(pubkeys, pubkeys->len-pubkeys->pos),
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291 pubkeys->len-pubkeys->pos);
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292
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293 buf_free(pubkeys);
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294 md5_done(&hs, hash);
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295
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296 /* "md5 hexfingerprinthere\0", each hex digit is "AB:" etc */
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297 buflen = 4 + 3*MD5_HASH_SIZE;
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298 ret = (char*)m_malloc(buflen);
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299
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300 memset(ret, 'Z', buflen);
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301 strcpy(ret, "md5 ");
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302
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303 for (i = 4, h = 0; i < buflen; i+=3, h++) {
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304 ret[i] = hexdig(hash[h] >> 4);
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305 ret[i+1] = hexdig(hash[h] & 0x0f);
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306 ret[i+2] = ':';
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307 }
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308 ret[buflen-1] = 0x0;
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309
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310 return ret;
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311 }
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312
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313 #else /* use SHA1 rather than MD5 for fingerprint */
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314 static char * sign_key_sha1_fingerprint(sign_key *key, int type) {
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315
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316 char * ret;
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317 hash_state hs;
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318 buffer *pubkeys;
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319 unsigned char hash[SHA1_HASH_SIZE];
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320 unsigned int h, i;
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321 unsigned int buflen;
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322
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323 sha1_init(&hs);
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324
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325 pubkeys = buf_new(1000);
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326 buf_put_pub_key(pubkeys, key, type);
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327 buf_setpos(pubkeys, 4);
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328 /* skip the size int of the string - this is a bit messy */
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329 sha1_process(&hs, buf_getptr(pubkeys, pubkeys->len-pubkeys->pos),
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330 pubkeys->len-pubkeys->pos);
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331
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332 buf_free(pubkeys);
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333 sha1_done(&hs, hash);
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334
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335 /* "sha1 hexfingerprinthere\0", each hex digit is "AB:" etc */
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336 buflen = 5 + 3*SHA1_HASH_SIZE;
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337 ret = (char*)m_malloc(buflen);
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338
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339 strcpy(ret, "sha1 ");
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340
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341 for (i = 5, h = 0; i < buflen; i+=3, h++) {
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342 ret[i] = hexdig(hash[h] >> 4);
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343 ret[i+1] = hexdig(hash[h] & 0x0f);
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344 ret[i+2] = ':';
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345 }
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346 ret[buflen-1] = 0x0;
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347
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348 return ret;
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349 }
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350
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351 #endif /* MD5/SHA1 switch */
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352
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353 /* This will return a freshly malloced string, containing a fingerprint
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354 * in either sha1 or md5 */
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355 char * sign_key_fingerprint(sign_key *key, int type) {
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356
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357 #ifdef DROPBEAR_MD5_HMAC
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358 return sign_key_md5_fingerprint(key, type);
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359 #else
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360 return sign_key_sha1_fingerprint(key, type);
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361 #endif
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362 }
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363
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364 void buf_put_sign(buffer* buf, sign_key *key, int type,
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365 const unsigned char *data, unsigned int len) {
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366
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367 buffer *sigblob;
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368
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369 sigblob = buf_new(1000);
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370
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371 #ifdef DROPBEAR_DSS
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372 if (type == DROPBEAR_SIGNKEY_DSS) {
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373 buf_put_dss_sign(sigblob, key->dsskey, data, len);
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374 }
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375 #endif
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376 #ifdef DROPBEAR_RSA
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377 if (type == DROPBEAR_SIGNKEY_RSA) {
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378 buf_put_rsa_sign(sigblob, key->rsakey, data, len);
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379 }
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380 #endif
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381 if (sigblob->len == 0) {
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382 dropbear_exit("non-matching signing type");
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383 }
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384
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385 buf_setpos(sigblob, 0);
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386 buf_putstring(buf, buf_getptr(sigblob, sigblob->len),
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387 sigblob->len);
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388
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389 buf_free(sigblob);
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390
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391 }
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392
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393 #ifdef DROPBEAR_SIGNKEY_VERIFY
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394 /* Return DROPBEAR_SUCCESS or DROPBEAR_FAILURE.
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395 * If FAILURE is returned, the position of
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396 * buf is undefined. If SUCCESS is returned, buf will be positioned after the
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397 * signature blob */
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398 int buf_verify(buffer * buf, sign_key *key, const unsigned char *data,
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399 unsigned int len) {
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400
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401 unsigned int bloblen;
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402 unsigned char * ident = NULL;
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403 unsigned int identlen = 0;
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404
34
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405 TRACE(("enter buf_verify"));
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406
4
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407 bloblen = buf_getint(buf);
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408 ident = buf_getstring(buf, &identlen);
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409
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410 #ifdef DROPBEAR_DSS
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411 if (bloblen == DSS_SIGNATURE_SIZE &&
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412 memcmp(ident, SSH_SIGNKEY_DSS, identlen) == 0) {
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413 m_free(ident);
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414 return buf_dss_verify(buf, key->dsskey, data, len);
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415 }
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416 #endif
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417
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418 #ifdef DROPBEAR_RSA
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419 if (memcmp(ident, SSH_SIGNKEY_RSA, identlen) == 0) {
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420 m_free(ident);
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421 return buf_rsa_verify(buf, key->rsakey, data, len);
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422 }
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423 #endif
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424
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425 m_free(ident);
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426 dropbear_exit("non-matching signing type");
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427 return DROPBEAR_FAILURE;
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428 }
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429 #endif /* DROPBEAR_SIGNKEY_VERIFY */